vhost/net: fix heads usage of ubuf_info
[ Upstream commit 46aa92d1ba162b4b3d6b7102440e459d4e4ee255 ]
ubuf info allocator uses guest controlled head as an index,
so a malicious guest could put the same head entry in the ring twice,
and we will get two callbacks on the same value.
To fix use upend_idx which is guaranteed to be unique.
Reported-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Cc: stable@kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 4134e53..50a3cb5 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -235,7 +235,8 @@
msg.msg_controllen = 0;
ubufs = NULL;
} else {
- struct ubuf_info *ubuf = &vq->ubuf_info[head];
+ struct ubuf_info *ubuf;
+ ubuf = vq->ubuf_info + vq->upend_idx;
vq->heads[vq->upend_idx].len = len;
ubuf->callback = vhost_zerocopy_callback;